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CVE-2026-64014— Input: usbtouchscreen - clamp NEXIO data_len/x_len to URB buffer size

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会开源的一款操作系统内核。 Linux kernel 2.6.34版本存在安全漏洞，该漏洞源于nexio_read_data()函数从设备中断数据包中提取data_len和x_len字段，且未对从URB缓冲区读取的数据长度进行有效限制，导致设备可伪造长度值，造成约64 KiB越界读取，相邻内核内存内容可能以ABS_X/ABS_Y事件泄露至用户空间，进一步读取可能导致内核崩溃。

AI Predicted 5.4 Difficulty: Hard EPSS 0.22% · P12

Possible ATT&CK Techniques 1 AI

T1005 · Data from Local System

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 5197424cdcccd2b0b1922babb93969b2515c43ce< 45c829e5eb3b974282bae50b7cca2cc891f74f0b affected
5197424cdcccd2b0b1922babb93969b2515c43ce< e7cdcb266ba06d8480809b78ab8bb2bf8ff51ccb affected
5197424cdcccd2b0b1922babb93969b2515c43ce< 95f47331dfde243f93e679ce70bd0c24b37c683d affected
5197424cdcccd2b0b1922babb93969b2515c43ce< d883312061ccde8c536595998aaf687ec070077c affected
5197424cdcccd2b0b1922babb93969b2515c43ce< 103d2de9f505f56da173e43f12dba62f92620278 affected
5197424cdcccd2b0b1922babb93969b2515c43ce< 0ca809ea8e0355299266c46e5f1755040aa8dcf3 affected
5197424cdcccd2b0b1922babb93969b2515c43ce< 7585b6aa55d8ac85ad22f522e1059f93507727b6 affected
5197424cdcccd2b0b1922babb93969b2515c43ce< 2905281cbda52ec9df540113b35b835feb5fafd3 affected
… +10 more rows
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I. Basic Information for CVE-2026-64014

Vulnerability Information
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Vulnerability Title
Input: usbtouchscreen - clamp NEXIO data_len/x_len to URB buffer size
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: Input: usbtouchscreen - clamp NEXIO data_len/x_len to URB buffer size nexio_read_data() pulls data_len and x_len from a packed __be16 header in the device's interrupt packet and then walks packet->data[0..x_len) and packet->data[x_len..data_len) comparing each byte against a threshold. Both fields are 16-bit on the wire (max 65535). The existing adjustments shave at most 0x100 / 0x80 off, so the loop bound can still reach roughly 0xfeff. The URB transfer buffer for NEXIO is rept_size (1024) bytes from usb_alloc_coherent(), with the first 7 occupied by the packed header — so packet->data[] has 1017 valid bytes. read_data() callbacks are not given urb->actual_length, and nothing else bounds the walk. A device that lies about its length can get a ~64 KiB out-of-bounds read past the coherent DMA allocation. The first index whose byte exceeds NEXIO_THRESHOLD lands in begin_x / begin_y and from there into the reported touch coordinates, so adjacent kernel memory contents leak to userspace as ABS_X / ABS_Y events. Far enough out, the read can also hit an unmapped page and fault. Fix this all by clamping data_len to the buffer's data[] capacity and x_len to data_len.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会开源的一款操作系统内核。 Linux kernel 2.6.34版本存在安全漏洞，该漏洞源于nexio_read_data()函数从设备中断数据包中提取data_len和x_len字段，且未对从URB缓冲区读取的数据长度进行有效限制，导致设备可伪造长度值，造成约64 KiB越界读取，相邻内核内存内容可能以ABS_X/ABS_Y事件泄露至用户空间，进一步读取可能导致内核崩溃。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 5197424cdcccd2b0b1922babb93969b2515c43ce ~ 45c829e5eb3b974282bae50b7cca2cc891f74f0b -
Linux Linux 2.6.34 -

II. Public POCs for CVE-2026-64014

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III. Intelligence Information for CVE-2026-64014

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Patches & Fixes for CVE-2026-64014 (7)

Same Patch Batch · Linux · 2026-07-19 · 429 CVEs total

CVE-2026-63795 10.0 CRITICAL 9p: avoid putting oldfid in p9_client_walk() error path
CVE-2026-63887 9.8 CRITICAL scsi: target: iscsi: Bound iscsi_encode_text_output() appends to rsp_buf
CVE-2026-63994 9.8 CRITICAL tunnels: load network headers after skb_cow() in iptunnel_pmtud_build_icmp[v6]()
CVE-2026-64035 9.8 CRITICAL igc: set tx buffer type for SMD frames
CVE-2026-64142 9.8 CRITICAL ksmbd: close durable scavenger races against m_fp_list lookups
CVE-2026-63993 9.8 CRITICAL vxlan: do not reuse cached ip_hdr() value after skb_tunnel_check_pmtu()
CVE-2026-53399 9.8 CRITICAL nfsd: release layout stid on setlease failure
CVE-2026-53398 9.8 CRITICAL NFSD: Fix SECINFO_NO_NAME decode error cleanup
CVE-2026-63825 9.8 CRITICAL gcov: use atomic counter updates to fix concurrent access crashes
CVE-2026-64025 9.8 CRITICAL bpf, skmsg: fix verdict sk_data_ready racing with ktls rx
CVE-2026-64033 9.8 CRITICAL RDMA/rtrs: Fix use-after-free in path file creation cleanup
CVE-2026-63886 9.8 CRITICAL scsi: target: iscsi: Validate CHAP_R length before base64 decode
CVE-2026-64125 9.8 CRITICAL net: bcmgenet: keep RBUF EEE/PM disabled
CVE-2026-64091 9.8 CRITICAL batman-adv: tt: fix TOCTOU race for reported vlans
CVE-2026-63808 9.8 CRITICAL exfat: fix potential use-after-free in exfat_find_dir_entry()
CVE-2026-63978 9.8 CRITICAL net/handshake: Drain pending requests at net namespace exit
CVE-2026-63979 9.8 CRITICAL net/handshake: hand off the pinned file reference to accept_doit
CVE-2026-64132 9.8 CRITICAL ipv6: ioam: refresh hdr pointer before ioam6_event()
CVE-2026-64136 9.8 CRITICAL smb: client: protect tc_count increment in smb2_find_smb_sess_tcon_unlocked()
CVE-2026-63800 9.8 CRITICAL pNFS: Fix use-after-free in pnfs_update_layout()

Showing top 20 of 429 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-64014

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